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Pictures of the year: Space

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A small section of the expanding remains of the Veil Nebula, a massive star that exploded about 8,000 years ago. The entire nebula is 110 light-years across, covering six full moons on the sky as seen from Earth, and resides about 2,100 light-years away in the constellation Cygnus, the Swan. Image taken by NASA's Hubble Space Telescope. Released September 24, 2015. REUTERS/NASA/ESA/Hubble Heritage Team

A supermassive black hole with millions to billions times the mass of our sun is seen in a NASA artist's concept illustration. In this image, the supermassive black hole at the center is surrounded by matter flowing onto the black hole in what is termed an accretion disk. This disk forms as the dust and gas in the galaxy falls onto the hole, attracted by its gravity. Also shown is an outflowing jet of energetic particles, believed to be powered by the black hole's spin. REUTERS/NASA/JPL-Caltech

An expanding shell of debris called SNR 0519-69.0 is left behind after a massive star exploded in the Large Magellanic Cloud, a satellite galaxy to the Milky Way. Multimillion degree gas is seen in X-rays from Chandra, in blue. The outer edge of the explosion (red) and stars in the field of view are seen in visible light from the Hubble Space Telescope. Image released January 23, 2015. REUTERS/NASA/CXC/SAO

An artist's rendering depicts a solar storm hitting Mars and stripping ions from the planet's upper atmosphere. Scientists have documented a solar storm blasting away Mars� atmosphere, an important clue in a long-standing mystery of how a planet that was once like Earth turned into a cold, dry desert. In March, NASA�s Mars-orbiting MAVEN spacecraft caught such a storm stripping away the planet�s atmosphere. Image released November 5, 2015. REUTERS/NASA/Goddard Space Flight Center

A pink astral cloud appeared in the sky of Tucson, Arizona, after a NASA rocket launch from White Sands, New Mexico, February 25, 2015. The unusual pink cloud was caused by a NASA research rocket launched to study the outer reaches of Earth's atmosphere, scientists said. REUTERS/White Sands Missile Range

Astronaut Edwin E. Aldrin Jr., lunar module pilot, walks on the surface of the moon near the leg of the Lunar Module (LM) "Eagle" during the Apollo 11 extravehicular activity (EVA) on July 20, 1969. The photograph is one of more than 12,000 from NASA's archives recently aggregated on the Project Apollo Archive Flickr account. REUTERS/NASA

A mid-level solar flare is seen in an image from NASA's Solar Dynamics Observatory on January 12, 2015. Harmful radiation from a solar flare cannot pass through Earth's atmosphere to physically affect humans on the ground, however -- when intense enough -- they can disturb the atmosphere in the layer where GPS and communications signals travel, according to NASA. REUTERS/NASA/SDO

Pluto's haze layer shows its blue color in this picture taken by NASA's New Horizons Ralph/Multispectral Visible Imaging Camera released October 8, 2015. The high-altitude haze is thought to be similar in nature to that seen at Saturn's moon Titan. This image was generated by software that combines information from blue, red and near-infrared images to replicate the color a human eye would perceive as closely as possible. REUTERS/NASA/JHUAPL/SwRI

Researchers have found evidence that a white dwarf star may have ripped apart a planet as it came too close, as seen in this NASA Chandra X-ray Observatory image of a globular cluster designated as NGC 6388 released April 17, 2015. Using several telescopes, researchers have found evidence that a white dwarf star, the dense core of a star like the Sun that has run out of nuclear fuel may have ripped apart a planet as it came too close. REUTERS/NASA